More than 100 million people around the world now use e cigarettes, including at least 15 million children, according to the World Health Organization (WHO). The organisation has warned that vaping is fuelling Percentage of E cigarette Vape Users in Several Countries Around the Download Scientific Diagram 2.3% of US population reports current e cigarette use Vaping Could Be 'Potentially Even More' Harmful to Hearts Than Smoking, Scientists Warn Newsweek